[cfe-dev] libc++ MinGW build failure

[Ruben Van Boxem]

2012/11/11 Howard Hinnant <hhinnant at apple.com>

>
> On Nov 11, 2012, at 12:31 PM, Ruben Van Boxem <vanboxem.ruben at gmail.com>
> wrote:
>
> > Hi,
> >
> > I wanted to take another look at libc++ on Windows,
>
> Thanks!
>
> > but I get a build failure due to (I think) libc++ itself:
> >
> > + clang++ -c -g -Os -fPIC -std=c++0x -fstrict-aliasing -Wall -Wextra
> -Wshadow -Wconversion -Wpadded -Wmissing-prototypes -Wstrict-aliasing=2
> -Wstrict-overflow=4 -nostdinc++ -I../include ../src/condition_variable.cpp
> > In file included from ../src/condition_variable.cpp:10:
> > ../include\condition_variable:158:25: error: constructor for
> 'std::__1::condition_variable_any' must explicitly initialize the member
> '__cv_' which does not have a default constructor
> > condition_variable_any::condition_variable_any()
> >                         ^
>
> Just looking at this first one:  condition_variable is required to have a
> default constructor.  condition_variable (in <__mutex_base>) is currently
> only implemented on top of pthread_cond_t, and does have a default
> constructor if pthread_cond_t exists.  Does pthread_cond_t exist in your
> environment?
>

Yes, I rely on winpthreads to provide the stuff used by libc++ (I really
should take the time to learn all this and write a proper Win32
implementation, but I'm currently too lazy to do so ;-)). pthread_cond_t is
defined in pthread.h. I checked the preprocessed source (attached) and it
is indeed typedef'ed. This worked last time I updated the test results :/

Ruben


> Howard
>
>
> > ../include\condition_variable:121:24: note: member is declared here
> >     condition_variable __cv_;
> >                        ^
> > ../include\__mutex_base:301:23: note: 'std::__1::condition_variable'
> declared here
> > class _LIBCPP_VISIBLE condition_variable
> >                       ^
> > In file included from ../src/condition_variable.cpp:11:
> > ../include\thread:433:11: error: no matching constructor for
> initialization of 'std::__1::mutex'
> >     mutex __mut;
> >           ^
> > ../include\__mutex_base:48:5: note: candidate constructor not viable:
> requires 1 argument, but 0 were provided
> >     mutex(const mutex&);// = delete;
> >     ^
> > In file included from ../src/condition_variable.cpp:11:
> > ../include\thread:434:24: error: no matching constructor for
> initialization of 'std::__1::condition_variable'
> >     condition_variable __cv;
> >                        ^
> > ../include\__mutex_base:314:5: note: candidate constructor not viable:
> requires 1 argument, but 0 were provided
> >     condition_variable(const condition_variable&); // = delete;
> >     ^
> > In file included from ../src/condition_variable.cpp:10:
> > In file included from ../include\condition_variable:112:
> > ../include\memory:2087:40: error: constructor for
> >
> 'std::__1::__libcpp_compressed_pair_imp<std::__1::allocator<std::__1::mutex>,
> std::__1::mutex, 1>' must explicitly initialize the member '__second_'
> which does not have a default constructor
> >     _LIBCPP_INLINE_VISIBILITY explicit
> __libcpp_compressed_pair_imp(_T1_param __t1)
> >                                        ^
> > ../include\memory:2369:11: note: in instantiation of member function
> >
> 'std::__1::__libcpp_compressed_pair_imp<std::__1::allocator<std::__1::mutex>,
> std::__1::mutex, 1>::__libcpp_compressed_pair_imp' requested here
> >         : base(_VSTD::forward<_T1_param>(__t1)) {}
> >           ^
> > ../include\memory:3693:12: note: in instantiation of member function
> >       'std::__1::__compressed_pair<std::__1::allocator<std::__1::mutex>,
> std::__1::mutex>::__compressed_pair' requested here
> >         :  __data_(_VSTD::move(__a)) {}
> >            ^
> > ../include\memory:4272:26: note: in instantiation of member function
> >       'std::__1::__shared_ptr_emplace<std::__1::mutex,
> std::__1::allocator<std::__1::mutex>>::__shared_ptr_emplace' requested here
> >     ::new(__hold2.get()) _CntrlBlk(__a2,
> _VSTD::forward<_Args>(__args)...);
> >                          ^
> > ../include\memory:4631:12: note: in instantiation of function template
> specialization
> >       'std::__1::shared_ptr<std::__1::mutex>::make_shared<>' requested
> here
> >     return
> shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
> >            ^
> > ../include\condition_variable:159:14: note: in instantiation of function
> template specialization 'std::__1::make_shared<std::__1::mutex, >'
> requested here
> >     : __mut_(make_shared<mutex>()) {}
> >              ^
> > ../include\memory:2075:9: note: member is declared here
> >     _T2 __second_;
> >         ^
> > ../include\__mutex_base:34:23: note: 'std::__1::mutex' declared here
> > class _LIBCPP_VISIBLE mutex
> >                       ^
> > 4 errors generated.
> >
> > This is with Clang 3.1. Any ideas?
> >
> > Thanks,
> >
> > Ruben
> >
> > PS: please keep me in CC, I am not subscribed to cfe-dev
> >
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
>
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